I haven't heard about the story of The Nutcracker before, so this review is going to be purely about this movie. First of all, this movie is kids-appropriate, however, selected scenes (like climbing rock) may not be suitable for kids since they are dangerous acts.
Overall, Clara shows her determination of knowing the secret that lies within her present from her mom. I believe that this moral value teaches the kids to appreciate what they own because these items can be more valuable than they think. Secondly, this movie explores the nature of how some people will judge someone's behavior (whether they are good or bad) based on their physical appearance. In this case, most of the characters believe that Mother Ginger is the villain in the movie because of her physical appearance and this info has been told by Sugar Plum (who is "pretty"), which turns out that Sugar Plum is the real villain in the movie, not Mother Ginger. This part of the story has challenged our consciousness when we make an assumption towards someone that we don't know well.
In brief, I love this movie and it will be a great movie for the entire family. Parental guidance is advised for the viewing of young audience.